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Old 28th October 2013, 09:19 AM   #11
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Originally Posted by moschfet View Post
No, but this is not a Diamond circuit.
'Diamond circuit' or 'diamond amp' is amplifier with diamond buffer on input stage?
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Old 28th October 2013, 09:56 AM   #12
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Originally Posted by borys View Post
Maybe You can use similar topology as krell ksa 100.
Few examples bellow + diamond amp I have made recently.
For two first stages maybe it would be handy to use ccs instad of zeners supplies ?

Or idea nr 2:
-j-fet differential amps (I have used them even in ax11/sansui amp with no changes in circuit)
-bjt differential amps
-Vas
-driver
-output stage


One question, why 4 differential amps ? Two amps (as ksa100) + predriver+vas+driver+output stage should be good too.
KSA100 is simple symmetrical amplifier, it's slow with high THD, I want made low TIM amp with high SR... Input stage in HD50 work with +/-15V rail I add another gain stage (diamond differential) with gain 20X to drive VAS...
Why your diamond amp use current divider instead multiplier in VAS?
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Old 28th October 2013, 10:42 AM   #13
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Originally Posted by OnAudio View Post
Thank you Apex for all you do for audio. Thanks for posting. Just a few quick ones
Are you using +-45V rails ? . I suppose diamond stands for in house name of this amplifier ?

kind regards,

Harrison.
HD50 will use +/-45V rails if I made it
Regards

Last edited by apexaudio; 28th October 2013 at 11:00 AM.
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Old 28th October 2013, 10:48 AM   #14
tinitus is offline tinitus  Europe
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any plans about which transisters ?
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Old 28th October 2013, 10:53 AM   #15
forr is offline forr  France
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The Diamond name is the object of many desires.
It is already found in a Sansui circuit with a standard input stage (US patent #4229705) allowing a very high maximal slew-rate, as output of op-amps (Jung) or as input of CFAs and current conveyors.
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Old 28th October 2013, 11:10 AM   #16
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Originally Posted by tinitus View Post
any plans about which transisters ?
BC547/557 in LTP, MPSA42/92 in DD, MJE340/350 in VAS... plans for test.
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Old 28th October 2013, 11:12 AM   #17
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Hi Mr Mile,
So here we start the HD-series amp... by Apexaudio
there will be 3 variants (I'm guessing)
HD-50, HD-100, & HD-200

Why not the BC550-560 for input LTP?
& cascaded if more higher voltage is used?
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Last edited by JOHN BALI; 28th October 2013 at 11:16 AM. Reason: LTP transistor
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Old 28th October 2013, 11:23 AM   #18
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Originally Posted by JOHN BALI View Post
Hi Mr Mile,
So here we start the HD-series amp... by Apexaudio
there will be 3 variants (I'm guessing)
HD-50, HD-100, & HD-200

Why not the BC550-560 for input LTP?
& cascaded if more higher voltage is used?
There will be HD50, HD150 and HD300.
BC550/560 can be use for LTP and many others transistors, no need to cascaded, LTP rail is +/-15V. There will be cascode in DD and VAS for higher rails.
Regards
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Old 28th October 2013, 11:50 AM   #19
borys is offline borys  Poland
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Mile
I just was wondering if there is anythink special in diamond topology, diamond buffers are all over the net, so I just added 2 current sources and tef stage into it and it worked just fine and is simple. The results are there SR around 60u/us and thd nearly not mesurable:

BG3 - diamond amp - simple

I was thinking how to improve the input stage but I have lack of knowlage and ideas.

Your amp is very interesting, buffored front stage is really good idea (I will defenetley build it).
There is one think that I do not know how to explain, I did listening tests of 2 nearly same circuits (one has toshibas TO92-mod second has 2n5xx1 tranies), there was audiable diffrence heard strigt away in bass area, the one with 2n5xx1 was bit deeper and more soft.
Another think - I just had changed 2 resistors in second diamond stage (reducing biasing by 50%) and harmonics character has changed totally - I do not know if this is specyfic case of my circuit or kind of diamond topology characteristics. It looks like that there is a way to fine tune the amp with listening test.

In your amp prapobly there will be a way too to fine tune the amp with listening sessions. I would put j-fets at input buffer anyway.
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Old 28th October 2013, 12:47 PM   #20
Rieds is offline Rieds  Indonesia
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I tried the schematic on ltspice.
I replaced R10K with 1K8 & added some capacitors for amp stability.
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Last edited by Rieds; 28th October 2013 at 12:54 PM.
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